Porcelain Fungus (Oudemansiella mucida)
O. mucida is a widespread and common beech wood species. Appearing in late summer to late autumn it is typically found on rotting beech trunks and fallen branches where it grows in clusters. It is semi-translucent, slimy and white in appearance. When O. mucida is found on a beech tree it usually outcompetes other fungi nearby by means of a powerful anti-fungal agent called strobilurin. It is saprobic [deriving its nourishment from non-living or decaying organic matter] or weakly parasitic to living beech trees. While it has a strong connection to beech, it has also been found growing on oak on rare occasions.
The above group was recently photographed around three metres up a mature beech tree.
Buczacki, S., Shields, C. and Ovenden, D. (2012). Collins Fungi Guide: The most complete field guide to the mushrooms and toadstools of Britain & Ireland. London: HarperCollins, p. 200, fig. p.201.
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Sterry, P. and Hughes. B. (2009). Collins Complete Guide to British Mushrooms and Toadstools. London: HarperCollins, p. 138, fig. pp. 138-139.